<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>
    <el-steps :active="1" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="提交课程"/>
    </el-steps>
    <el-form label-width="120px">
      <el-form-item label="课程标题">
        <el-input v-model="courseInfo.title" placeholder=" 示例：机器学习项目课：从基础到搭建项目视频课程。专业名称注意大小写"/>
      </el-form-item>
      <!-- 所属分类 TODO -->
      <!-- 一级分类 -->
      <el-form-item label="课程类别">
        <el-select
          v-model="courseInfo.subjectParentId"
          placeholder="请选择" @change="subjectLevelOneChanged">
          <el-option
            v-for="subject in subjectNestedList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"/>
        </el-select>
        <!-- 二级分类 -->
        <el-select v-model="courseInfo.subjectId" placeholder="请选择">
          <el-option
            v-for="subject in subSubjectList"
            :key="subject.value"
            :label="subject.title"
            :value="subject.id"/>
        </el-select>
      </el-form-item>
      <!-- 课程讲师 TODO -->
      <el-form-item label="课程讲师">
        <el-select
          v-model="courseInfo.teacherId"
          placeholder="请选择">
          <el-option
            v-for="teacher in teacherList"
            :key="teacher.id"
            :label="teacher.name"
            :value="teacher.id"/>
        </el-select>
      </el-form-item>
      <el-form-item label="总课时">
        <el-input-number :min="0" v-model="courseInfo.lessonNum" controls-position="right" placeholder="请填写课程的总课时数"/>
      </el-form-item>
      <!-- 课程简介 TODO -->
      <el-form-item label="课程简介">
        <!--<tinymce :height="300" v-model="courseInfo.description"/>-->
            <wang :content="content" ref="description"></wang>
      </el-form-item>
      <!-- 课程封面 TODO -->
      <el-form-item label="课程封面">
        <el-upload
          :show-file-list="false"
          :on-success="handleAvatarSuccess"
          :before-upload="beforeAvatarUpload"
          :action="BASE_API+'/vod/eduoss/file/upload'"
          class="avatar-uploader">
          <img :src="courseInfo.cover">
        </el-upload>
      </el-form-item>

      <el-form-item label="课程价格">
        <el-input-number :min="0" v-model="courseInfo.price" controls-position="right" placeholder="免费课程请设置为0元"/> 元
      </el-form-item>
      <el-form-item>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">保存并下一步</el-button>
      </el-form-item>
    </el-form>

  </div>
</template>

<script>
  import course from '@/api/edu/course'
  import subject from '@/api/edu/subject'
  import teacher from '@/api/edu/teacher'
  /*import Tinymce from '@/components/Tinymce'*/
  import wang from '@/components/Wangeditor'

  const defaultForm = {
    title: '',
    subjectId: '',
    teacherId: '',
    lessonNum: 0,
    description: '',
    subjectParentId:'',
    cover: '../static/1.jpg',
    price: 0
  }

  export default {
    components: { wang },
    data() {
      return {
        content: '',
        courseInfo: defaultForm,
        saveBtnDisabled: false ,// 保存按钮是否禁用
        subjectNestedList: [],//一级分类列表
        subSubjectList: [],//二级分类列表
        teacherList: [], // 讲师列表
        BASE_API:process.env.BASE_API,
      }
    },

    watch: {
      $route(to, from) {
        console.log('watch $route')
        this.init()
      },

    },

    created() {
      console.log('info created')
      this.init()
    },

    methods: {
      initTeacherList() {
        teacher.getList().then(response => {
          this.teacherList = response.data.item
        })
      },
      //一级分类改变监听事件
      subjectLevelOneChanged(value) {
        for (var i = 0; i < this.subjectNestedList.length; i++) {
          var oneSubject=this.subjectNestedList[i]
          if(value==oneSubject.id){
            this.subSubjectList=oneSubject.children
            this.courseInfo.subjectId=''
          }

        }
      },
      init() {

        if (this.$route.params && this.$route.params.id) {
          const id = this.$route.params.id
          //根据id获取课程基本信息
          this.fetchCourseInfoById(id)
        } else {
          this.courseInfo = { ...defaultForm }
          this.initSubjectList()
          this.initTeacherList()
        }

      },

      fetchCourseInfoById(id) {
        course.getCourseInfoById(id).then(responseCourse => {
          this.courseInfo = responseCourse.data.item
          this.content=this.courseInfo.description
          // 初始化分类列表
          subject.getNestedTreeList().then(responseSubject => {
            this.subjectNestedList = responseSubject.data.items
            for (let i = 0; i < this.subjectNestedList.length; i++) {
              if (this.subjectNestedList[i].id === this.courseInfo.subjectParentId) {
                this.subSubjectList = this.subjectNestedList[i].children
              }
            }
          })
          // 获取讲师列表
          this.initTeacherList()
        }).catch((response) => {
          this.$message({
            type: 'error',
            message: response.message
          })
        })
      },

      updateData() {
        this.saveBtnDisabled = true
        this.courseInfo.description=this.$refs.description.editorContent
        course.updateCourseInfoById(this.courseInfo).then(response => {
          this.$message({
            type: 'success',
            message: '修改成功!'
          })
          return response// 将响应结果传递给then
        }).then(response => {
          this.$router.push({ path: '/course/chapter/' + this.$route.params.id })
        }).catch((response) => {
          // console.log(response)
          this.$message({
            type: 'error',
            message: '保存失败'
          })
        })
      },

      initSubjectList() {
        subject.getNestedTreeList().then(response => {
          this.subjectNestedList = response.data.items
        })
      },
      next() {
        console.log('next')
        this.saveBtnDisabled = true
        if (!this.courseInfo.id) {
          this.saveData()
        } else {
          this.updateData()
        }
      },

      // 保存
      saveData() {
        this.courseInfo.description=this.$refs.description.editorContent
        course.saveCourseInfo(this.courseInfo).then(response => {
          this.$message({
            type: 'success',
            message: '保存成功!'
          })
          return response// 将响应结果传递给then
        }).then(response => {
          this.$router.push({ path: '/course/chapter/' + response.data.courseId })
        }).catch((response) => {
          this.$message({
            type: 'error',
            message: "保存失败"
          })
        })
      },

      handleAvatarSuccess(res, file) {

        this.courseInfo.cover = res.data.url
      },
      beforeAvatarUpload(file) {
        const isJPG = file.type === 'image/jpeg'
        const isLt2M = file.size / 1024 / 1024 < 2
        if (!isJPG) {
          this.$message.error('上传头像图片只能是 JPG 格式!')
        }
        if (!isLt2M) {
          this.$message.error('上传头像图片大小不能超过 2MB!')
        }
        return isJPG && isLt2M
      }
    }
  }
</script>
<style scoped>
  .tinymce-container {
    line-height: 29px;
  }
</style>
